The Rapid Naval Armaments Supplement Programme (マル急計画, 出師準備第一着作業建艦計画, Maru Kyū Keikaku, Suishi-Junbi Dai-Ichi Chakusagyō Kenkan Keikaku) was one of the armaments expansion plan of the Imperial Japanese Navy (IJN).
In August 1941, the IJN started building warships for war. It extended to 293 vessels, 300,000 tons.
| Category | Class | Vessel number(s) | Completed | Converted | Cancelled |
| Heavy cruiser | Ibuki | #300 - 301 | #300 was converted to aircraft carrier | #301 | |
| Aircraft carrier | Unryū | #302 | Unryū (#302) | ||
| Seaplane tender | Akitsushima | #303 | #303 | ||
| Fleet oiler | Kazahaya | #304 - 307 | Kazahaya (#304) | #306 was converted to the Hayasui class | #305, 307 |
| Hayasui | Hayasui (#306) | ||||
| Escort ship Type-A | Etorofu | #310 - 339 | Etorofu (#310), Matsuwa (#311), Sado (#312), Oki (#313), Mutsure (#314), Iki (#315), Tsushima (#316), Wakamiya (#317), Hirato (#318), Fukae (#319), Amakusa (#321), Manju (#323), Kanju (#325), Kasado (#330) | #320, #322, #324, #326 - 329 and #331 - 339 were converted to the Mikura class | |
| Escort ship Type-B | Mikura | Mikura (#320), Miyake (#322), Awaji (#324), Nōmi (#326), Kurahashi (#327), Chiburi (#329), Yashiro (#331), Kusagaki (#334) | #328, #333 and #339 were converted to the Hiburi class #332 and #335 - 338 were converted to the Ukuru class |
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| Hiburi | Hiburi (#328), Daitō (#333), Shōnan (#339) | ||||
| Ukuru | Ukuru (#332), Okinawa (#335), Amami (#336), Aguni (#337), Shinnan (#338) | ||||
| Destroyer Type-A | Yūgumo | #340 - 355 | Hayanami (#340), Hamanami (#341), Okinami (#342), Kishinami (#343), Asashimo (#344), Hayashimo (#345), Akishimo (#346), Kiyoshimo (#347) | #348 - 355 | |
| Destroyer Type-B | Akizuki | #360 - 369 | Shimotsuki (#360), Fuyutsuki (#361), Harutsuki (#362), Yoizuki (#363), Natsuzuki (#364), Hanazuki (#366) | #367 - 369 | |
| Cruiser submarine Type-B | I-40 | #370 - 375 | I-40 (#370) to I-45 (#375) | ||
| Cruiser submarine Type-C | I-16 | #376 - 378 | I-46 (#376) to I-48 (#378) | ||
| S49B | #379 - 381 | #379 - 381 | |||
| Medium-sized submarine | Ro-35 | #385 - 396 | Ro-44 (#385) to Ro-50 (#391), Ro-55 (#396) | #392 - 395 | |
| Ro-100 | #400 - 408 | Ro-109 (#400) to Ro-117 (#408), | |||
| Minesweeper | No.19 | #410 - 437 | No.25 (#410) to No.30 (#415), No.33 (#418), No.34 (#419), No.38 (#423), No.39 (#424), No.41 (#426) | #416 - 417, #420 - 422, #425, #427 - 437 | |
| Subchaser | No.13 | #440 - 459 | No.40 (#440) to No.58 (#458) | #459 | |
| Minelayer | Ajiro | #460 - 473 | Ajiro (#460) | #461 - 473 | |
| Auxiliary minesweeper | Aux. No.1 | #480 - 495 | Aux. No.7 (#480) to Aux. No.22 (#495) | ||
| Auxiliary subchaser | Aux. No.1 | #500 - 599 | Aux. No.1 (#500) to Aux. No.100 (#599) | ||
| Patrol torpedo boat | No.10 | #600 | No.10 (#600) | ||
| No.11 | #601 - 617 | No.11 (#601) to No.16 (#606) | #607 - 617 |